Malvern Hydro 2000uP User Manual page 32

Chapter 3

A pre-measurement delay can be added before the measurement to allow thermal
equilibration to occur after ultrasound has been applied. If this is not done the anal-
ysis may show the presence of large particles which are not in the sample. This is
caused by the refractive index differences observed in the sample cell when the dis-
persant is not equilibrated. Choose a delay sufficiently long enough for adequate
thermal equilibration to occur.
To set the delay, highlight either the minutes or seconds in the entry box, then use
the selection arrows to alter the time; alternatively the time can be typed in. A delay
of between 0 and 59.59 minutes can be chosen.

It is possible to monitor the temperature of the sample and dispersant and to set the
software to only make measurements between specified limits.
Temperature monitoring is enabled by selecting the Allow measurements
only.... check box.
The options are:
Page 3-8
Pre-Measurement Delay
Temperature Monitoring
Lower/upper limit – this section specifies the temperature range within
which the sample/dispersant must be for the measurement to start. This limit
must be in the range of 10° to 35°C.
Stabilising temperature – the time for which the temperature must be stable
before the measurement proceeds.
Time-out period – the measurement will be abandoned if the temperature is
not stabilised within this time period.
Software features
MAN 0389